22 Aug
2001
22 Aug
'01
3:22 a.m.
I need a new 6502 for my Commodore 8032 (see posts passim); and it looks
like there's a couple of options available, both CMOS and at a variety of
speeds from 1-6MHz.
However, both DIL variants are available in in plastic or ceramic carriers
- what is the advantage/disadvantage of either of those?
22 Aug
22 Aug
1:37 p.m.
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4:09 p.m.
At 11:37 pm 22/08/2001 +0100, you wrote:
I thought it *may* be something like that. I notice the QL uses a ceramic
MC68008, perhaps this meant they didn't need a heatsink on it.
However, both
DIL variants are available in in plastic or ceramic carriers
- what is the advantage/disadvantage of either of those?
Ceramic packages generally work over a larger temperature range, and may
be more reliable under harsh conditions. Plastic pacakges are cheaper. For a PET, it doesn't matter which one you use
IMHO.
Probably not... I don't suppose a 1MHz chip (especially a big one like the
6502) is being driven hard enough to get seriously hot.
Cheers!
Ade.
--
B-Racing: B where it's at :-)
http://www.b-racing.co.uk
24 Aug
24 Aug
8:56 p.m.
Adrian Vickers skrev:
At 11:37 pm 22/08/2001 +0100, you wrote:
>> However, both DIL variants are available in in plastic or ceramic carriers
>> - what is the advantage/disadvantage of either of those?
>
>Ceramic packages generally work over a larger temperature range, and may
>be more reliable under harsh conditions. Plastic pacakges are cheaper.
I thought it *may* be something like that. I notice the
QL uses a ceramic
MC68008, perhaps this meant they didn't need a heatsink on it.
I must say that I've never seen a 68000 (or 68008 for that matter) with a
heatsink, be it in Amigas, HPs, Ataris or industrial systems. The 68000
doesn't heat up like a Pentium or a 68040.
OTOH, could any one confirm whether the 68000 was only available in ceramics
at first? The only non-plastic one I've seen was in a very old system.
--
En ligne avec Thor 2.6a.
"Wer nichts zu sagen hat, sagt es auf Englisch."
(-Walter Kr?mer, bez?gl. Anglizismen.)
28 Aug
28 Aug
8:38 a.m.
--- Iggy Drougge <optimus(a)canit.se> wrote:
Adrian Vickers skrev:
OTOH, could any one confirm whether the 68000 was only available in
ceramics at first? The only non-plastic one I've seen was in a very old
system.
I have several pre-1980 MC68000 processors in ceramic. My former boss
has an XC68000 in ceramic (with a serial number engraved on the lid - #424)
I do not recall seeing plastic 68000s until after 1985.
It's not proof, but it's some points on the graph.
-ethan
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9:12 a.m.
The XC designation normally was applied to pre-production and engineering
samples. The MC is what's on most of my early 68000's. I do believe that
1984-85 was when the 68HC000's became available, and THEY were certainly plastic
parts.
That was the timeframe during which they released their 'HC11's as well, and I
think that had to do with their HCMOS process. Once that was underway,
everything went to HCMOS, since it was a cheaper process.
Dick
----- Original Message -----
From: "Ethan Dicks" <erd_6502(a)yahoo.com>
To: <classiccmp(a)classiccmp.org>
Sent: Tuesday, August 28, 2001 11:38 AM
Subject: Re: Plastic or Ceramic?
--- Iggy Drougge <optimus(a)canit.se> wrote:
Adrian Vickers skrev:
OTOH, could any one confirm whether the 68000 was only available in
ceramics at first? The only non-plastic one I've seen was in a very old
system.
I have several pre-1980 MC68000 processors in ceramic. My former boss
has an XC68000 in ceramic (with a serial number engraved on the lid - #424)
I do not recall seeing plastic 68000s until after 1985.
It's not proof, but it's some points on the graph.
-ethan
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Make international calls for as low as $.04/minute with Yahoo! Messenger
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5 comments
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participants (5)
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ard＠p850ug1.demon.co.uk -
avickers＠solutionengineers.com -
edick＠idcomm.com -
erd_6502＠yahoo.com -
optimus＠canit.se